Mail consumes a lot of resources making the os unusable

I'm having a weird problem with Apple Mail: After launching, the program rapidly starts taking a lot of the system resources making it impossible to run any other program.
CPU utilization is very high, the Mail process takes around 2.5 Gb of RAM (real memory) and over 20 Gb of virtual memory.
The only thing Mail appears to be doing is updating it's cache.
What could be wrong? Besides using another mail client, what are my options?
Thanks.

Hi eroussel,
I'd suggest to try the following for starters:
When launching Mail.app, try opening the mail activity monitor by going to Window --> Activity, or command-0. It should show you some detailed information on if anything is happening in the background in regards to talking to your mail server, smtp server, etc.
As Linc Davis said, try booting in Safe Mode and see if the same thing happens.
If the same thing happens in Safe Mode, try deleting the mail account (assuming you only have one) and re-create it again using the settings from your mail provider. Be sure to backup your computer first!!
While doing all of this, leave the Activity monitor up from both Mail.app and the Mac OS X system Activity Monitor.
Hope this helps point you in the right direction.

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I changed my message according to your recommendations.
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This was a simple problem to fix. Why the hell was I told to come here? You mean I can just DOWNLOAD a new fan?
This is what I need: A NEW FAN DAMMIT!
Not stories from other folks that had the same problem. Geeze, you would think that was the DEMOCRATIC way solve this problem, let's all just talk about and maybe it will fix itself...
Sorry, it has been a long day and this email was the straw that broke my camel's back.
Does ANYONE know of a REAL email address where I can actually ask a REAL person for a replacement fan?
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Did you notice this in the e-mail MSI sent you:
------------------------------------------------------------------------- We hope the directions below answer your question. If your problem still cannot be solved after going through all the suggestions, then you can reply this e-mail containing the automatic reply with your original e-mail. We will get back to you as soon as possible.
I don't know much about this, but you may be able to buy a comparable fan fron your local computer store - take the card in and ask the guy about it (I understand computer/graphics card fans are not very expensive).
It might be worth a try.
Of course, the card may not accept any other kind of fan - it all depends on how it attaches to the card.
If you do return the card to MSI there may be be postal charges etc. so the computer store MAY be your best, quickest, and cheapest option.
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